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The word act, as used in the term Act of Congress, is a common, not a proper noun. The capitalization of the word act is deprecated by some dictionaries and usage authorities. Some writers, in particular the U.S. Code, capitalize Act.
<br /><br /> If you're referring to a specific court, such as the Supreme Court of the United States, or the US Supreme Court, as it's known colloquially, you need to capitalize. <br /><br /> The same rules apply to justices.